In the period immediately following Croatia's declaration of independence from Yugoslavia in 1991, it was common to see unofficial oval stickers with the letters "CRO" sold across Croatia. Despite the initial anticipation that Croatia's international vehicle registration code would be "CRO", Croatia officially opted for the 2-letter "HR" (Hrvatska) code instead.

Formerly Great Britain, Saorstát Éireann, Éire. Currently there is a campaign underway by Irish Language activists to have the name of the country in the native language represented by changing the code back to EIR or ÉIR. This is unnecessary, as Statutory Instrument No. 269 of 1961 provides: " ... the letters EIR are used to indicate the name of the State but the letters IRL may be substituted therefor."